4''-O-[3-({2-[(3-carboxy-1-cyclopropyl-1,4-dihydro-4-oxoquinolin-7-yl)amino]butyl}amino)propanoyl]-6-O-methylerythromycin A

4''-O-(3-{4-[3-(1-ethyl-3-ethoxycarbonyl-1,4-dihydro-4-oxo-quinolin-6-yl)propyl]piperazin-1-yl}propionyl)-6-O-methyl-erythromycin A

4''-O-(3-{4-[3-(1-cyclopropyl-3-ethoxycarbonyl-1,4-dihydro-4-oxo-quinolin-6-yl)propyl]piperazin-1-yl}propionyl)-6-O-methyl-erythromycin A